Balancing those mods "by default" that way would make them quite unbalanced, actually -- they're balanced for vanilla, most of the time. It should be your job to get things working the way you want if you have a billion mods installed, which is why config files are an important part of mod packs. Unless you mess up and make MPS crazy good on IC2 energy
Also, yeah, balance isn't only a matter of things being too easy. Being too hard also means something is unbalanced. UP UP UP
Geez i didn't want to derail this topic anymore but you are forcing me to do so.
Ofc i can sift through every config there is to make it as balanced as possible but at the end of the day i won't be able to achieve any good. For 80% of the things it is the mod authors who have to give the possibiliy to either adjust things or make them balanced against other mods by default.
Also the vanilla argument is kinda invalid. MPS for example detects which mods are installed and disables/enables recipes accordingly. So you can balance your mod against different setups. One could even ask the communitiy for feedback what they think would be balanced (although i suspect they would not give good feedback for the most part as the cheaper way will always be preferred to others).
A good example for not beeing able to adjust balance was that it is impossible (at the moment!) to adjust MFRs machines and how much energy they take. If i could do that i would happily do it, make them draw a significant amount of power to get them on par with Forestry farms but i can't.
ONTOPIC:
I really don't get it why people most often
ONLY bitch about GregTech nerfing things/makeing them harder/more tedious(which is only true for the really high tier things). At the same time they don't start threads about other mods chaning vanilla recipes/mechanics or why some mod makes another mod nearly obsolete (TE and IC2 anyone?) [Don't get me wrong TE is a fine mod and there are still things in IC2 TE doesn't have, but it has pretty much replaced IC2 as a starting mod)
EDIT:
All posts in this thread reflect my own personal opinion on this matter.
In no way i want anyone to think that this is what we (as in the FTB Team) think about it.